I wonder if it could be possible to start such a project for Oric games?

As we all know, maybe more than half of the Oric games archive is in French. Just because of that, I am not able to play them.

I don't want to start an issue of "which language is international". But what I know is nearly all the french frends already know to speak english but people in UK and other countries like me, French is not as common as english.

I always wish to play excellent Oric games produced after the firm is sold to France.

1st, on the technical side: if you don't have the source code, the words you translate must fit in the same space than the original words. This can be a problem as, for instance, "épée" in French (sword) is a four letters word that you can't translate by "sword" which is 5 letters.
2nd, on the language side: my experience shows that for a good translation, you need either a real bi-lungual person, or (for our case) a French and an English person. If you don't some translations might sound weird, or even totally impossible to understand.
3rd on the cultural side - which is a bit similar to the 2nd. When there are cultural references (to TV shows, movies, other games or whatever), you'd better work with someone from the "original version" country so he tells you. And once you know, should you adapt it? For instance, if a game refers to François Mitterrand (French president in the 80's), should we change his name for someone in the UK?
4th on the time side - which is a bit similar to the 3rd. When something refers to old stories, should it be adapted to nowadays? For instance again, François Mitterand, should we replace him by 80's Margaret Thatcher or by nowadays David Cameron?

Jim Groom and I had begun working on translating Le Fer d'Amnukor loong ago, but it was so complicated that we never finished.

Well that shouldn't be impossible for BASIC games... But as symoon said, it has some difficulties. And I'd add that you need to be quite an expert in the game, so you recognize the texts and commands, where they are used, if they give hints or have more than one evident meaning...

But as soon as the game has compressed texts or the parser is done in asm, etc. you'll have problems and it won't be an easy task at all!